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There's a little bit of operator error here. I speak from experience.
For the first month of owning this camera, I was frustrated by the slow focus in the dark. I found that I could set the focus manually, but it wouldn't store this, so every time the camera was turned on, I would need to go through the menus to set the focus manually again. Without doing this, the camera would take a picture about a minute after pushing the button.
The solution was to find the right check boxes in the configuration menu to have the focus and a few other things stored in memory. Now I set the camera to manually focus at 6' in program mode and it is stored. Point and shoot digitals, with their minute sensors have really long depth of field, so if you're a few inches off in your distance estimation, it's no big deal, the focus will be fine. The rub here is that you have to decide how far away you will be before hand. For me 6' works well for fishing pictures at the widest focal length.
This would solve your problem of the camera auto-focusing when you press the "shutter release". The exposure shouldn't be too different as long as you don't shine your light into the lens.
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